The 1980 murder of Nanine Grimes is the subject of Investigation Discovery’s “Motives and Murders: Cracking the Case,” airing Saturday locally at 7 p.m. on Investigation Discovery. The 15-year-old was found, stabbed to death, on her sister’s waterbed. It took nearly 25 years and DNA evidence to solve the homicide.

Joanne Ostrow has been watching TV since before "reality" required quotation marks. "Hill Street Blues" was life-changing. If Dickens, Twain or Agatha Christie were alive today, they'd be writing for television. And proud of it.